Messages in this thread | | | From | Pintu Agarwal <> | Date | Fri, 18 Jan 2019 15:38:48 +0530 | Subject | Need help: how to locate failure from irq_chip subsystem |
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Hi All,
Currently, I am trying to debug a boot up crash on some qualcomm snapdragon arm64 board with kernel 4.9. I could find the cause of the failure, but I am unable to locate from which subsystem/drivers this is getting triggered. If you have any ideas or suggestions to locate the issue, please let me know.
This is the snapshot of crash logs: [ 6.907065] Unable to handle kernel NULL pointer dereference at virtual address 00000000 [ 6.973938] PC is at 0x0 [ 6.976503] LR is at __ipipe_ack_fasteoi_irq+0x28/0x38 [ 7.151078] Process qmp_aop (pid: 24, stack limit = 0xfffffffbedc18000) [ 7.242668] [< (null)>] (null) [ 7.247416] [<ffffff9469f8d2e0>] __ipipe_dispatch_irq+0x78/0x340 [ 7.253469] [<ffffff9469e81564>] __ipipe_grab_irq+0x5c/0xd0 [ 7.341538] [<ffffff9469e81d68>] gic_handle_irq+0xc0/0x154
[ 6.288581] [PINTU]: __ipipe_ack_fasteoi_irq - called [ 6.293698] [PINTU]: __ipipe_ack_fasteoi_irq: desc->irq_data.chip->irq_hold is NULL
When I check, I found that the irq_hold implementation is missing in one of the irq_chip driver (expected by ipipe), which I am supposed to implement.
But I am unable to locate which irq_chip driver. If there are any good techniques to locate this in kernel, please help.
Thanks, Pintu
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